<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>key的原理</title>
    <script type="text/javascript" src="../js/vue.js"></script>
</head>
<body>
      <div id="root">
        <!--遍历数组-->
        <h2>人员列表(遍历数组)</h2>
        <button @click.once="add">添加一个老刘</button>
        <ul>
            <li v-for="(p,index) of persons" :key="index">
                {{p.name}}-{{p.age}}
                <input type="text">
            </li>
        </ul>
      </div>
      
      <script type="text/javascript">
        Vue.config.productionTip = false

        new Vue({
            el:'#root',
            data:{
                persons:[
                    {id:'001',name:'张三',age:18},
                    {id:'002',name:'李四',age:19},
                    {id:'003',name:'王五',age:20}
                ]
            },
            methods:{
                add(){
                    const p = {id:'004',name:'老刘',age:40}
                    this.persons.unshift(p)
                }
            },
        })
      </script>
</body>
</html>